Dell Latitude 7320 Detachable Owner's manual

Latitude 7320 Detachable

Service Manual

Regulatory Model: T04H

Regulatory Type: T04H001

March 2021

Rev. A00

Notes, cautions, and warnings

NOTE: A NOTE indicates important information that helps you make better use of your product.

CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid

the problem.

WARNING: A WARNING indicates a potential for property damage, personal injury, or death.

trademarks may be trademarks of their respective owners.

Chapter 1: Working inside your computer...................................................................................... 6

Before working inside your computer.............................................................................................................................6

Safety precautions.............................................................................................................................................................. 6

Electrostatic discharge—ESD protection......................................................................................................................7

ESD field service kit ........................................................................................................................................................... 7

After working inside your computer................................................................................................................................8

Chapter 2: Removing and installing components........................................................................... 9

Recommended tools........................................................................................................................................................... 9

Screw list............................................................................................................................................................................... 9

Subscriber Identity Module (SIM) card......................................................................................................................... 11

Removing the SIM tray................................................................................................................................................11

Installing the SIM tray................................................................................................................................................. 12

Display assembly.................................................................................................................................................................13

Removing the display assembly................................................................................................................................ 13

Installing the display assembly...................................................................................................................................17

Solid-state drive................................................................................................................................................................. 21

Removing the M.2 solid-state drive.........................................................................................................................21

Installing the M.2 solid-state drive.......................................................................................................................... 22

WWAN card........................................................................................................................................................................ 24

Removing the WWAN card....................................................................................................................................... 24

Installing the WWAN card......................................................................................................................................... 25

Speakers.............................................................................................................................................................................. 26

Removing the left speaker........................................................................................................................................ 26

Installing the left speaker...........................................................................................................................................27

Removing the right speaker......................................................................................................................................28

Installing the right speaker........................................................................................................................................ 28

Rear Camera.......................................................................................................................................................................29

Removing the rear-facing camera...........................................................................................................................29

Installing the rear-facing camera.............................................................................................................................30

Microphone module.......................................................................................................................................................... 32

Removing the right microphone modules.............................................................................................................. 32

Installing the right microphone modules................................................................................................................ 32

Removing the left microphone module.................................................................................................................. 33

Installing the left microphone modules...................................................................................................................34

Front Camera..................................................................................................................................................................... 35

Removing the front-facing camera.........................................................................................................................35

Installing the front-facing camera........................................................................................................................... 36

Kick stand............................................................................................................................................................................36

Removing the Kick stand...........................................................................................................................................36

Installing the kick stand..............................................................................................................................................37

Kickstand Hinges............................................................................................................................................................... 39

Removing the kick stand hinges.............................................................................................................................. 39

Installing the kick stand hinges................................................................................................................................ 39

Contents

Contents 3

Docking connector............................................................................................................................................................40

Removing the docking connector............................................................................................................................40

Installing the docking connector...............................................................................................................................41

Hall sensor daughter board............................................................................................................................................. 43

Removing the Hall sensor daughter board............................................................................................................ 43

Installing the Hall sensor daughter board.............................................................................................................. 43

Heat sink..............................................................................................................................................................................44

Removing the heat sink..............................................................................................................................................44

Installing the heat sink................................................................................................................................................45

System fan.......................................................................................................................................................................... 47

Removing the left fan.................................................................................................................................................47

Installing the left fan...................................................................................................................................................48

Removing the right system fan................................................................................................................................49

Installing the right fan................................................................................................................................................ 49

Volume button daughter board......................................................................................................................................50

Removing the Volume button daughter board.....................................................................................................50

Installing the volume button daughter board........................................................................................................ 51

Power-button board......................................................................................................................................................... 52

Removing the power-button board........................................................................................................................ 52

Installing the power-button board...........................................................................................................................53

Fingerprint reader............................................................................................................................................................. 54

Removing the fingerprint reader............................................................................................................................. 54

Installing the fingerprint reader............................................................................................................................... 55

Battery................................................................................................................................................................................. 56

Lithium-ion battery precautions...............................................................................................................................56

Removing the battery.................................................................................................................................................57

Installing the battery...................................................................................................................................................58

System board..................................................................................................................................................................... 59

Removing the system board..................................................................................................................................... 59

Installing the system board........................................................................................................................................61

Smart card reader............................................................................................................................................................. 64

Removing the smart card reader............................................................................................................................. 64

Installing the smart card reader............................................................................................................................... 65

Chapter 3: Software.................................................................................................................... 68

Operating system.............................................................................................................................................................. 68

Downloading the drivers.................................................................................................................................................. 68

Chapter 4: System setup.............................................................................................................69

Entering BIOS without keyboard...................................................................................................................................69

System setup options.......................................................................................................................................................69

General screen options.............................................................................................................................................. 69

System Configuration screen options.................................................................................................................... 70

System Configuration screen options..................................................................................................................... 71

Video screen options.................................................................................................................................................. 73

Security screen options..............................................................................................................................................73

Secure Boot.................................................................................................................................................................. 74

Intel software Guard Extensions..............................................................................................................................75

Performance screen options.....................................................................................................................................75

4

Contents

Power Management screen options....................................................................................................................... 75

POST Behavior.............................................................................................................................................................76

Virtualization Support options.................................................................................................................................. 77

Wireless screen options..............................................................................................................................................77

Maintenance................................................................................................................................................................. 78

System logs screen options...................................................................................................................................... 78

System Log......................................................................................................................................................................... 78

Updating the BIOS ........................................................................................................................................................... 78

Updating your system BIOS using a USB flash drive................................................................................................79

System and setup password...........................................................................................................................................80

Assigning a system setup password....................................................................................................................... 80

Deleting or changing an existing system setup password..................................................................................81

Chapter 5: Troubleshooting.........................................................................................................82

Dell SupportAssist Pre-boot System Performance Check diagnostics................................................................82

Running the SupportAssist Pre-Boot System Performance Check................................................................82

System diagnostic lights.................................................................................................................................................. 83

Recovering the operating system................................................................................................................................. 84

Flashing BIOS (USB key).................................................................................................................................................84

Flashing the BIOS..............................................................................................................................................................85

WiFi power cycle............................................................................................................................................................... 85

Flea power release............................................................................................................................................................ 85

Chapter 6: Getting help and contacting Dell................................................................................ 86

Contents

5

Working inside your computer

Topics:

• Before working inside your computer

•

Safety precautions

• Electrostatic discharge—ESD protection

• ESD field service kit

• After working inside your computer

Before working inside your computer

About this task

NOTE: The images in this document may differ from your computer depending on the configuration you ordered.

Steps

1. Save and close all open files and exit all open applications.

2. Shut down your computer. Click Start >

Power > Shut down.

NOTE:

If you are using a different operating system, see the documentation of your operating system for shut-down

instructions.

3. Disconnect your computer and all attached devices from their electrical outlets.

4. Disconnect all attached network devices and peripherals, such as keyboard, mouse, and monitor from your computer.

CAUTION:

To disconnect a network cable, first unplug the cable from your computer and then unplug the

cable from the network device.

5. Remove any media card and optical disc from your computer, if applicable.

Safety precautions

The safety precautions chapter details the primary steps to be taken before performing any disassembly instructions.

Observe the following safety precautions before you perform any installation or break/fix procedures involving disassembly or

reassembly:

● Turn off the system and all attached peripherals.

● Disconnect the system and all attached peripherals from AC power.

● Disconnect all network cables, telephone, and telecommunications lines from the system.

● Use an ESD field service kit when working inside any tabletnotebookdesktop to avoid electrostatic discharge (ESD) damage.

● After removing any system component, carefully place the removed component on an anti-static mat.

● Wear shoes with non-conductive rubber soles to reduce the chance of getting electrocuted.

Standby power

Dell products with standby power must be unplugged before you open the case. Systems that incorporate standby power are

essentially powered while turned off. The internal power enables the system to be remotely turned on (wake on LAN) and

suspended into a sleep mode and has other advanced power management features.

1

6 Working inside your computer

Unplugging, pressing and holding the power button for 15 seconds should discharge residual power in the system board. Remove

the battery from tablets.notebooks.

Bonding

Bonding is a method for connecting two or more grounding conductors to the same electrical potential. This is done through

the use of a field service electrostatic discharge (ESD) kit. When connecting a bonding wire, ensure that it is connected to bare

metal and never to a painted or non-metal surface. The wrist strap should be secure and in full contact with your skin, and

ensure that you remove all jewelry such as watches, bracelets, or rings prior to bonding yourself and the equipment.

Electrostatic discharge—ESD protection

ESD is a major concern when you handle electronic components, especially sensitive components such as expansion cards,

processors, memory DIMMs, and system boards. Very slight charges can damage circuits in ways that may not be obvious, such

as intermittent problems or a shortened product life span. As the industry pushes for lower power requirements and increased

density, ESD protection is an increasing concern.

Due to the increased density of semiconductors used in recent Dell products, the sensitivity to static damage is now higher than

in previous Dell products. For this reason, some previously approved methods of handling parts are no longer applicable.

Two recognized types of ESD damage are catastrophic and intermittent failures.

● Catastrophic – Catastrophic failures represent approximately 20 percent of ESD-related failures. The damage causes

an immediate and complete loss of device functionality. An example of catastrophic failure is a memory DIMM that has

received a static shock and immediately generates a "No POST/No Video" symptom with a beep code emitted for missing or

nonfunctional memory.

● Intermittent – Intermittent failures represent approximately 80 percent of ESD-related failures. The high rate of

intermittent failures means that most of the time when damage occurs, it is not immediately recognizable. The DIMM

receives a static shock, but the tracing is merely weakened and does not immediately produce outward symptoms related to

the damage. The weakened trace may take weeks or months to melt, and in the meantime may cause degradation of memory

integrity, intermittent memory errors, etc.

The more difficult type of damage to recognize and troubleshoot is the intermittent (also called latent or "walking wounded")

failure.

Perform the following steps to prevent ESD damage:

● Use a wired ESD wrist strap that is properly grounded. The use of wireless anti-static straps is no longer allowed; they do not

provide adequate protection. Touching the chassis before handling parts does not ensure adequate ESD protection on parts

with increased sensitivity to ESD damage.

● Handle all static-sensitive components in a static-safe area. If possible, use anti-static floor pads and workbench pads.

● When unpacking a static-sensitive component from its shipping carton, do not remove the component from the anti-static

packing material until you are ready to install the component. Before unwrapping the anti-static packaging, ensure that you

discharge static electricity from your body.

● Before transporting a static-sensitive component, place it in an anti-static container or packaging.

ESD field service kit

The unmonitored Field Service kit is the most commonly used service kit. Each Field Service kit includes three main components:

anti-static mat, wrist strap, and bonding wire.

Components of an ESD field service kit

The components of an ESD field service kit are:

● Anti-Static Mat – The anti-static mat is dissipative and parts can be placed on it during service procedures. When using an

anti-static mat, your wrist strap should be snug and the bonding wire should be connected to the mat and to any bare metal

on the system being worked on. Once deployed properly, service parts can be removed from the ESD bag and placed directly

on the mat. ESD-sensitive items are safe in your hand, on the ESD mat, in the system, or inside a bag.

● Wrist Strap and Bonding Wire – The wrist strap and bonding wire can be either directly connected between your wrist

and bare metal on the hardware if the ESD mat is not required, or connected to the anti-static mat to protect hardware that

is temporarily placed on the mat. The physical connection of the wrist strap and bonding wire between your skin, the ESD

Working inside your computer

7

mat, and the hardware is known as bonding. Use only Field Service kits with a wrist strap, mat, and bonding wire. Never

use wireless wrist straps. Always be aware that the internal wires of a wrist strap are prone to damage from normal wear

and tear, and must be checked regularly with a wrist strap tester in order to avoid accidental ESD hardware damage. It is

recommended to test the wrist strap and bonding wire at least once per week.

● ESD Wrist Strap Tester – The wires inside of an ESD strap are prone to damage over time. When using an unmonitored

kit, it is a best practice to regularly test the strap prior to each service call, and at a minimum, test once per week. A

wrist strap tester is the best method for doing this test. If you do not have your own wrist strap tester, check with your

regional office to find out if they have one. To perform the test, plug the wrist-strap's bonding-wire into the tester while it is

strapped to your wrist and push the button to test. A green LED is lit if the test is successful; a red LED is lit and an alarm

sounds if the test fails.

● Insulator Elements – It is critical to keep ESD sensitive devices, such as plastic heat sink casings, away from internal parts

that are insulators and often highly charged.

● Working Environment – Before deploying the ESD Field Service kit, assess the situation at the customer location. For

example, deploying the kit for a server environment is different than for a desktop or portable environment. Servers are

typically installed in a rack within a data center; desktops or portables are typically placed on office desks or cubicles. Always

look for a large open flat work area that is free of clutter and large enough to deploy the ESD kit with additional space to

accommodate the type of system that is being repaired. The workspace should also be free of insulators that can cause an

ESD event. On the work area, insulators such as Styrofoam and other plastics should always be moved at least 12 inches or

30 centimeters away from sensitive parts before physically handling any hardware components.

● ESD Packaging – All ESD-sensitive devices must be shipped and received in static-safe packaging. Metal, static-shielded

bags are preferred. However, you should always return the damaged part using the same ESD bag and packaging that the

new part arrived in. The ESD bag should be folded over and taped shut and all the same foam packing material should be

used in the original box that the new part arrived in. ESD-sensitive devices should be removed from packaging only at an

ESD-protected work surface, and parts should never be placed on top of the ESD bag because only the inside of the bag is

shielded. Always place parts in your hand, on the ESD mat, in the system, or inside an anti-static bag.

● Transporting Sensitive Components – When transporting ESD sensitive components such as replacement parts or parts

to be returned to Dell, it is critical to place these parts in anti-static bags for safe transport.

ESD protection summary

It is recommended that all field service technicians use the traditional wired ESD grounding wrist strap and protective anti-static

mat at all times when servicing Dell products. In addition, it is critical that technicians keep sensitive parts separate from all

insulator parts while performing service and that they use anti-static bags for transporting sensitive components.

After working inside your computer

About this task

CAUTION: Leaving stray or loose screws inside your computer may severely damage your computer.

Steps

1. Replace all screws and ensure that no stray screws remain inside your computer.

2. Connect any external devices, peripherals, or cables you removed before working on your computer.

3. Replace any media cards, discs, or any other parts that you removed before working on your computer.

4. Connect your computer and all attached devices to their electrical outlets.

5. Turn on your computer.

8

Working inside your computer

Removing and installing components

NOTE: The images in this document may differ from your computer depending on the configuration you ordered.

Topics:

• Recommended tools

• Screw list

• Subscriber Identity Module (SIM) card

• Display assembly

• Solid-state drive

• WWAN card

• Speakers

• Rear Camera

• Microphone module

• Front Camera

• Kick stand

• Kickstand Hinges

• Docking connector

• Hall sensor daughter board

• Heat sink

• System fan

• Volume button daughter board

• Power-button board

• Fingerprint reader

• Battery

• System board

• Smart card reader

Recommended tools

The procedures in this document may require the following tools:

● Phillips screwdriver #0

● Plastic scribe

Screw list

NOTE:

When removing screws from a component, it is recommended to note the screw type, the quantity of screws, and

then place them in a screw storage box. This is to ensure that the correct number of screws and correct screw type is

restored when the component is replaced.

NOTE: Some systems have magnetic surfaces. Ensure that the screws are not left attached to such surface when

replacing a component.

NOTE: Screw color may vary with the configuration ordered.

Table 1. Latitude 5520Precision 3560 screw list

2

Removing and installing components 9

Table 1. Latitude 5520Precision 3560 screw list

Component Screw type Quantity Screw image

Base cover Captive screws 8

WLAN card bracket Captive screw 1

WWAN card bracket Captive screw 1

M.2 2230 solid-state drive M2x4 1

M.2 2280 solid-state drive M2x4 1

Assembly inner frame M2x3 12

3-cell battery M2x4 2

4-cell battery M2x4 3

System Fan M2x3 2

Heat sink—integrated

M2x3

Captive screws

1 - M2x3

4 - captive screws

Heat sink—discrete

M2x3

Captive screws

1 - M2x3

7 - captive screws

eDP cable/bracket M2x3 2

USB Type-C support bracket M2x4 3

System board M2x3 3

Power button M2x2 2

Smart card reader M2x3 2

LED board M2x3 1

Keyboard assembly M2x2 26

Keyboard bracket M2x2 10

Display assembly M2.5x5 (display hinge to

palm-rest assembly)

6

Display hinge M2.5x3.5 (display hinge to

display back cover)

4

10 Removing and installing components

Table 1. Latitude 5520Precision 3560 screw list

Component Screw type Quantity Screw image

Display panel M2.5x3.5 4

Subscriber Identity Module (SIM) card

Removing the SIM tray

Prerequisites

1. Follow the procedure in Before working inside your computer.

NOTE: SIM card or SIM card tray removal is only available on systems that are shipped with WWAN module. The procedure

for removal is only applicable for systems that are shipped with a WWAN module.

CAUTION: Removing the SIM card with the computer turned on, may cause data loss or damage to the card.

Ensure that your computer is turned off or the network connections are disabled.

About this task

The following images indicate the location of the SIM card and provide a visual representation of the removal procedure.

Removing and installing components

11

Steps

1. Insert a pin into the hole of the SIM card slot.

2. Push the pin inward to release the SIM card tray

3. Slide the SIM card tray out of the slot in the computer.

4. Remove the SIM card from the SIM card tray.

5. Slide the SIM card tray into the slot, until it clicks into place.

Installing the SIM tray

Prerequisites

If you are replacing a component, remove the existing component before performing the installation procedure.

NOTE: SIM card or SIM card tray removal is only available on systems that are shipped with WWAN module. Hence,

removing procedure is only applicable for systems that are shipped with WWAN module.

About this task

The following image indicates the location of the SIM card and provides a visual representation of the installation procedure.

Steps

1. Insert a pin into the hole of the SIM card tray and push inward to release the tray.

2. Slide the SIM card tray out of the slot on the computer.

3. Place the SIM card into the SIM card tray with the metallic contact facing down.

12

Removing and installing components

4. Align the SIM card tray with the slot in the computer and carefully slide it in.

5. Slide the SIM card tray into the slot, until it clicks into place.

Next steps

1. Follow the procedure in After working inside your computer.

Display assembly

Removing the display assembly

Prerequisites

1. Follow the procedure in Before working inside your system.

2. Remove the SIM tray.

About this task

The following images indicate the location of the display assembly and provide a visual representation of the removal procedure.

Removing and installing components 13

14 Removing and installing components

Removing and installing components 15

Steps

1. Open the kick stand to the widest possible angle, the system will power on.

NOTE:

The Latitude 7320 Detachable has an automatic power-on feature. The system powers on anytime the kick

stand is opened. Follow the below steps to ensure that the system does not power on while the performing replacement

procedures.

2. With the kick stand open, shut down the computer using the operating system.

3. Place the system on a padded surface with the display assembly facing down.

16

Removing and installing components

4.

CAUTION: Make sure that the system has already been powered off before removing the screws.

Remove the four (M1.6x4) screws securing the display panel to the display back cover.

5. Using a plastic scribe, push the two release holes next to the kick stand hinges to loosen the display assembly from the

display back cover.

6. Close the kick stand and flip the computer over with the display facing upwards.

7. Using a plastic scribe, pry open the display panel from the bottom-left or bottom-right corner.

8. Work your way around the top and remaining sides of the display panel.

9. Gently flip open the display assembly from the top edge and lay the display panel assembly face down.

CAUTION: Do NOT pull the display panel away from the base while the display panel is still connected to the

system board.

10. Slide the power switch on the system board from "PD1" to "PD2".

NOTE: After switching the power switch off, an LED indicator next to the switch will illuminate red, indicating that

power has been cut-off from the computer.

11. Remove the two (M2x2.5) screws that secure the display cable bracket to the system board.

12. Remove the display cable bracket from the computer.

13. Disconnect the display cable from the system board and remove the display assembly from the computer.

Installing the display assembly

Prerequisites

If you are replacing a component, remove the existing component before performing the installation procedure.

About this task

The following image indicates the location of the display assembly and provides a visual representation of the installation

procedure.

Removing and installing components

17

18 Removing and installing components

Removing and installing components 19

20 Removing and installing components

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Dell Latitude 7320 Detachable Owner's manual

Dell Latitude 7320 Detachable Owner's manual

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